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Table 1. Goodness of fit Tests for normal green and yellow seedlings observed in selfed progenies derived from normal green seedling plants of C. maxima. Number of seedlings Expected F3 families Normal Yellow ratio X 2 Segregant P-value 1 8 2 3:1 0.13 0.5-0.8 3 22 4 3:1 1.28 0.2-0.5 6 20 11 3:1 1.81 0.1-0.2 8 32 7 3:1 1.02 0.2-0.5 9 23 9 3:1 0.16 0.5-0.8 10 48 22 3:1 1.54 0.2-0.5 11 21 9 3:1 0.40 0.5-0.8 13 7 1 3:1 0.67 0.2-0.5 14 21 3 3:1 2.00 0.2-0.5 15 34 14 3:1 0.44 0.5-0.8 16 6 4 3:1 1.20 0.2-0.5 18 20 8 3:1 0.19 0.5-0.8 Non-segregant 2 44 0 1:0 4 43 0 1:0 5 34 0 1:0 7 11 0 1:0 12 27 0 1:0 17 48 0 1:0 Segregant:Non-segregant F3 families 2:1 0.001 0.95-0.99 74 Cucurbit Genetics Cooperative Report 28-29: 73-74 (2005-2006)
Another Relationship between Stem and Fruit Color in Cucurbita pepo Harry S. Paris, Fabian Baumkoler, and Aviva Hanan A.R.O. Newe Ya’ar Research Center, P. O. Box 1021, Ramat Yishay 30-095, Israel Introduction: Thirteen loci affecting fruit color have been identified in Cucurbita pepo L. (2). One of these loci, D, affects both, the color of the stem and the color of the intermediate-age and mature fruit (3). Plants of the recessive d/d genotype have light green stems. The dominant allele, D, causes the plant stem to become dark green at a young age, making it a useful phenotypic marker for estimating hybrid seed purity in crosses using a d/d female parent and a D/D male parent. The dominant D allele also results in darkening of the color of fruits that would otherwise be light in color, beginning about a week after anthesis and attaining full intensity by a week to 10 days later, at 15—18 days after anthesis. Thus, in intermediate-age and mature fruits, the dominant D allele is epistatic to the genes conferring light fruit color, l-1 and l-2. Ordinarily, plants having dark stems also have dark intermediate-age and mature fruits. Most cultivars of pumpkin and acorn squash serve as very numerous examples. On the other hand, there are a few exceptions. One of them is the scallop squash cultivar ‘White Bush Scallop’, which has light-colored fruit, conferred by the dominant allele W. This allele prevents darkening of intermediate-age fruit color and is epistatic to D in the fruit (1). However, this cultivar segregates for stem color (dark vs. light yellow-green stems). Materials and Methods: Two plants of ‘White Bush Scallop’, one having dark stems and one having light stems, were selfpollinated. Each bred true for stem and fruit color and their progeny were crossed with a near-isogenic D/D accession of ‘Vegetable Spaghetti’. The F1 plants from both crosses had light intermediate-age fruits, with the F1 plants from the dark-stem inbred having dark stems, whilst the F1 plants from the light-stem inbred had light stems. Thereafter, donor- parent stem and intermediate-age fruit colors were backcrossed for six generations into a near-isogenic D/D inbred of ‘Vegetable Spaghetti’ that was designated 540a-1-1-2-4. Sixth backcross-generation plants were selfpollinated and selected for donor-parent stem and fruit colors, this being repeated until truebreeding, new D/D lines were obtained, one having dark stems and light fruits and the other having light stems and light fruits. These three inbreds, 540a-1-1-2-4 and its two derivatives, were then intercrossed, with the ultimate purpose of elucidating the genetic basis of their differing fruit and stem colors. The plants were grown in the field at Newe Ya’ar Research Center, Ramat Yishay, Israel, in the summer and fall of 2004 and 2005. Results and Discussion: All three inbreds bred true. The light intermediate-age fruit color of 1278-2-12-3, conferred by W from ‘White Bush Scallop’, was dominant to the dark intermediate-age fruit color of 540a-1-1- 2-4 (Table 1). Likewise, the light fruit color of 1243-4-4-20 was dominant to the dark fruit color of 540a-1-1-2-4. The light stem of 1243-4-4-20 was dominant to the dark stem of both 540a-1-1-2-4 and 1278-2-12-3. The backcrosses to the recessive parent fit reasonably well the expected 1:1 ratio in each respective case, and the one F2 population, of dark-fruited crossed with light-fruited, fit the 1:3 ratio of dark:light, as expected. Light stem color was inherited together with light fruit color, except for one plant out of the 400 in the backcross to the dark-stem, dark-fruit inbred 540a-1-1-2-4. This exceptional plant had a dark stem but a light fruit. The dark stem, light fruit phenotype, observed and checked in the field, was not misclassified. There are several possibilities which could account for the co-inheritance (in all but 1 of 400 plants) of light fruit and light stem color, Cucurbit Genetics Cooperative Report 28-29: 75-76 (2005-2006) 75
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Cucurbit Genetics Cooperative 28-29
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NEWS & COMMENT v 30th Annual CGC Bu
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30th Annual CGC Business Meeting (2
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and emerging problems facing the se
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• R.L. Hassell, J. Schultheis, W.
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Control of Cucumber Grey Mold by En
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Discussion: Microbial endophytes ar
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Table 2. The effects of endophytic
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Systemic Resistance against Sphaero
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Results: Systemic induced resistanc
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Table1. Effects of inducers on the
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on visual appearance, cavities appe
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Literature Cited: 1. Danin-Poleg, Y
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A Recessive Gene for Light Immature
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SNP Discovery and Mapping in Melon
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Table 1. Genes associated with carb
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Page 41 and 42: Number of F2 plants Number of F2 pl
Page 43 and 44: Mapping of QTL for Fruit Size and S
Page 45 and 46: Table 2. Simple linear regression (
Page 47 and 48: Grafted Watermelon Stand Survival A
Page 49 and 50: ace, color, national origin, religi
Page 51 and 52: Rootstock Effects on Plant Vigor an
Page 53 and 54: Diann Baze and Dr. Benny Bruton for
Page 55 and 56: Pilot Survey Results to Prioritize
Page 57 and 58: Table 1. Results of the research ne
Page 59 and 60: A New Male Sterile Mutant Identifie
Page 61 and 62: Spontaneous Mutant Showing Pale See
Page 63 and 64: Figure 1. Comparison of pale green
Page 65 and 66: Genetic resistance to insect pests
Page 67 and 68: dominance being the largest gene ef
Page 69 and 70: watermelon (Citrullus lanatus (Thun
Page 71 and 72: gourd and watermelon. Proceedings o
Page 73 and 74: Figure 2. Watermelon seed size: 1 =
Page 75 and 76: Literature Cited: 1. Molinar, R., a
Page 77 and 78: Figure 2. Cultivar Allsweet, releas
Page 79 and 80: hermaphrodita, Momordica charantia,
Page 81 and 82: local farmers. One has dark green f
Page 83 and 84: amplified in C. moschata and C. max
Page 85: Inheritance of Yellow Seedling Leth
Page 89 and 90: Diversity within Cucurbita maxima a
Page 91 and 92: Precocious Yellow Rind Color in Cuc
Page 93 and 94: Contrary to what has been reported
Page 95 and 96: Figure 1. Range of mature fruit col
Page 97 and 98: Results: A total of 176 PI accessio
Page 99 and 100: Table 1. Sample size (n) and mean (
Page 101 and 102: Figure 3. Fruit and seed of Cucumis
Page 103 and 104: Genetic Variability in Ascorbic Aci
Page 105 and 106: Table 1.Total carotenoid and ascorb
Page 107 and 108: PBOG 54, PBOG 61, PBOG 76, PBOG 117
Page 109 and 110: additive gene action in the inherit
Page 111 and 112: Components / proportions Internodal
Page 113 and 114: Cucurbit Genetics Cooperative Repor
Page 115 and 116: Cucurbit Genetics Cooperative Repor
Page 117 and 118: Gene List 2005 for Cucumber Todd C.
Page 119 and 120: that a single recessive gene mp was
Page 121 and 122: Jones, 1971a; Soans et al., 1973).
Page 123 and 124: CsP440s/E1, CsP221/H3, CsC625/E1, C
Page 125 and 126: ecombination values. Youngner (1952
Page 127 and 128: Zijlstra (1987) also determined tha
Page 129 and 130: co - green corolla. Green petals th
Page 131 and 132: observed. Fl - Fruit length. Expres
Page 133 and 134: m-2 h andromonoecious-2. Bisexual f
Page 135 and 136: susceptibility. Pm-h from 'Wis. SMR
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white (WfWf YfYf ): wf from 'NPI '
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library DNA fragment Jayabaskaran,
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AB026821 Seedling RNA Encoding IAA
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Cochran, F. D. 1938. Breeding cucum
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cDNA sequence and very early expres
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esistance and powdery mildew lysozy
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Pyzenkov, V. I. and G. A. Kosareva.
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Shiomi, S., M. Yamamoto, T. Ono, K.
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for bitterfree foliage in cucumber.
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Acp-1 APS-11, Ap-1 1 Acid phosphata
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Fom-2 Fom1.2 Fusarium oxysporum mel
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ud stage (in Bulgaria 7). ms-5 - ma
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Pm-7 - Powdery mildew resistance-7.
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Y - Yellow epicarp. Dominant to whi
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Cm-AO4 AF233594 Ascorbate oxidase A
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Cm-XTH2 DQ914795 Xyloglucan endotra
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to downy mildew in Cucumis melo PI
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58. Jagger, I.C., T.W. Whitaker and
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99. Périn, C., L.S. Hagen, V. de C
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140. Zink, F.W. 1986. Inheritance o
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Aboul-Nasr, M. Hossam. Dept. Hortic
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Interests: myrothecium stem canker
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& 724966; Interests: cucumber, melo
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Kuginuki, Yasuhisa. National Instit
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Email: lmerrick@iastate.edu; Ph: 51
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Randhawa, Lakhwinder. Sakata Seed A
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Thompson, Gary A. Univ. Arkansas LR
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Alabama Dane, F Arkansas Morelock,
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Peru Holle, M Philippines Beronilla
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ARTICLE IV. Election and Appointmen
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